Extends runtime of your PVS-31 or ANVS NVG system Uses 4AA size batteries Weatherproof o-ring sealed battery compartment 2 built-in IR strobes for IFF 4-pin BNVD / Fischer power port Mil-spec polymer Select ANVS / LEMO power cord for AN/AVS-6/9/10 ANVIS, TNV/Sentinel, AN/PVS-23 (F5050), and GPNVG (ANVS configuration). Select BNVD / Fischer power cord for AN/PVS-31 & PVS-31A BNVD, BNVD-1531, GPNVG Direct replacement for PVS-31 Cold Weather Battery Pack LFG-094-A3